BMW E81 E82 E87 LCI E88 Engine N47S 123d ECU Kit DDE 7809002 CAS3 + Key Manual

BMW E81 E82 E87 E88 N47S 123d ECU Kit DDE CAS3 + Key Manual is an original electronic control unit designed for the N47S engine in the 123d version, compatible with a manual transmission. As part of the Electronic control modules and controllers group, it is responsible for precise engine management, ensuring stable power characteristics and proper integration with other vehicle systems.

Specifications and technical data

• SKU: 7809002
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809002
• Substitutable numbers: 13617811702, 7811702, 13618512589, 8512589, 13617812002 13617810002 13617808402 13618506325, 7812002 7810002 7808402 8506325, 13617809002 13617812502 13618508713, 7809002 7812502 8508713, 123d, N47S, 61359147195, 9147195, 0281013776, 0 281 013 776
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The presented engine computer is dedicated to BMW 1 Series models of the E81, E82, E87, and E88 generations with the N47S engine in the 123d version. The controller manages key engine operating parameters, such as fuel dosage, injection timing, and interaction with safety systems, which translates into consistent operation of the entire powertrain. Thanks to its adaptation to the specific engine and transmission configuration, it ensures proper communication with the vehicle's electrical system.

Compatibility and reference numbers

The module belongs to the group of original BMW controllers and has an assigned OEM part number as well as a set of interchangeable numbers, which facilitates the selection of the correct component based on service documentation or the VIN. The presence of multiple reference numbers allows for the safe use of the controller as a replacement in vehicles where different variants of the same ECU type were factory-installed, while maintaining hardware and software compatibility. To correctly select an engine computer for a specific vehicle, it is worth paying attention to the compatibility of markings and equipment configuration. Detailed tips on selection by VIN, interpretation of OEM and reference numbers, and installation principles can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

Integration with manual transmission

This engine computer is designed to work with a manual transmission, which is significant for torque control logic, throttle response, and interaction with safety systems. Properly matching the controller to the transmission type helps avoid communication errors in the vehicle network and ensures the correct operation of drive-related functions, such as traction control or driver assistance systems.

Product characteristics and service application

The offered controller comes from a BMW vehicle and is a used part, which provides a cost-effective solution while maintaining original build quality. This type of ECU is suitable both for standard replacement of a damaged module and for more advanced repairs of the injection system or engine wiring, where maintaining full compatibility with the factory vehicle architecture is required. If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as engine controllers, comfort modules, or safety system controllers, check the available parts in the BMW electronic control modules and controllers category.

Practical installation and operational tips

When replacing an engine computer in a BMW with an N47S unit, it is recommended to perform adaptation procedures and, if necessary, coding according to the specific vehicle's equipment. A properly selected and configured controller allows for restoring correct engine operation after an ECU failure, wiring damage, or problems resulting from previous unsuccessful repairs. For high-mileage vehicles, using an original used module is often a more cost-effective and technically safe solution than experimenting with unverified replacements.